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1
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'use strict';
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2
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3
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var isStream = module.exports = function (stream) {
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4
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return stream !== null && typeof stream === 'object' && typeof stream.pipe === 'function';
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5
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};
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6
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7
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isStream.writable = function (stream) {
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8
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return isStream(stream) && stream.writable !== false && typeof stream._write === 'function' && typeof stream._writableState === 'object';
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9
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};
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|
10
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11
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isStream.readable = function (stream) {
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12
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return isStream(stream) && stream.readable !== false && typeof stream._read === 'function' && typeof stream._readableState === 'object';
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13
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};
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|
14
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15
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isStream.duplex = function (stream) {
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16
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return isStream.writable(stream) && isStream.readable(stream);
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17
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};
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|
18
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19
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isStream.transform = function (stream) {
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20
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return isStream.duplex(stream) && typeof stream._transform === 'function' && typeof stream._transformState === 'object';
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21
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};
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